// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_GL_GL_SURFACE_GLX_H_
#define UI_GL_GL_SURFACE_GLX_H_

#include <stdint.h>

#include <string>

#include "base/compiler_specific.h"
#include "base/macros.h"
#include "ui/events/platform/platform_event_dispatcher.h"
#include "ui/gfx/geometry/size.h"
#include "ui/gfx/native_widget_types.h"
#include "ui/gfx/vsync_provider.h"
#include "ui/gfx/x/x11_types.h"
#include "ui/gl/gl_export.h"
#include "ui/gl/gl_surface.h"

namespace gfx {

// Base class for GLX surfaces.
class GL_EXPORT GLSurfaceGLX : public GLSurface {
public:
    GLSurfaceGLX();

    static bool InitializeOneOff();

    // These aren't particularly tied to surfaces, but since we already
    // have the static InitializeOneOff here, it's easiest to reuse its
    // initialization guards.
    static const char* GetGLXExtensions();
    static bool HasGLXExtension(const char* name);
    static bool IsCreateContextSupported();
    static bool IsCreateContextRobustnessSupported();
    static bool IsTextureFromPixmapSupported();
    static bool IsOMLSyncControlSupported();

    void* GetDisplay() override;

    // Get the FB config that the surface was created with or NULL if it is not
    // a GLX drawable.
    void* GetConfig() override = 0;

protected:
    ~GLSurfaceGLX() override;

private:
    DISALLOW_COPY_AND_ASSIGN(GLSurfaceGLX);
};

// A surface used to render to a view.
class GL_EXPORT NativeViewGLSurfaceGLX : public GLSurfaceGLX,
                                         public ui::PlatformEventDispatcher {
public:
    explicit NativeViewGLSurfaceGLX(gfx::AcceleratedWidget window);

    // Implement GLSurfaceGLX.
    bool Initialize(GLSurface::Format format) override;
    void Destroy() override;
    bool Resize(const gfx::Size& size,
        float scale_factor,
        bool has_alpha) override;
    bool IsOffscreen() override;
    gfx::SwapResult SwapBuffers() override;
    gfx::Size GetSize() override;
    void* GetHandle() override;
    bool SupportsPostSubBuffer() override;
    void* GetConfig() override;
    gfx::SwapResult PostSubBuffer(int x, int y, int width, int height) override;
    VSyncProvider* GetVSyncProvider() override;

protected:
    ~NativeViewGLSurfaceGLX() override;

private:
    // The handle for the drawable to make current or swap.
    GLXDrawable GetDrawableHandle() const;

    // PlatformEventDispatcher implementation
    bool CanDispatchEvent(const ui::PlatformEvent& event) override;
    uint32_t DispatchEvent(const ui::PlatformEvent& event) override;

    // Window passed in at creation. Always valid.
    gfx::AcceleratedWidget parent_window_;

    // Child window, used to control resizes so that they're in-order with GL.
    gfx::AcceleratedWidget window_;

    // GLXDrawable for the window.
    GLXWindow glx_window_;

    GLXFBConfig config_;
    gfx::Size size_;

    scoped_ptr<VSyncProvider> vsync_provider_;

    DISALLOW_COPY_AND_ASSIGN(NativeViewGLSurfaceGLX);
};

// A surface used to render to an offscreen pbuffer.
class GL_EXPORT UnmappedNativeViewGLSurfaceGLX : public GLSurfaceGLX {
public:
    explicit UnmappedNativeViewGLSurfaceGLX(const gfx::Size& size);

    // Implement GLSurfaceGLX.
    bool Initialize(GLSurface::Format format) override;
    void Destroy() override;
    bool IsOffscreen() override;
    gfx::SwapResult SwapBuffers() override;
    gfx::Size GetSize() override;
    void* GetHandle() override;
    void* GetConfig() override;

protected:
    ~UnmappedNativeViewGLSurfaceGLX() override;

private:
    gfx::Size size_;
    GLXFBConfig config_;
    // Unmapped dummy window, used to provide a compatible surface.
    gfx::AcceleratedWidget window_;

    // GLXDrawable for the window.
    GLXWindow glx_window_;

    DISALLOW_COPY_AND_ASSIGN(UnmappedNativeViewGLSurfaceGLX);
};

} // namespace gfx

#endif // UI_GL_GL_SURFACE_GLX_H_
